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(2/3)*x+4/7 = 110/21 // - 110/21
(2/3)*x+4/7-(110/21) = 0
(2/3)*x+4/7-110/21 = 0
2/3*x-14/3 = 0 // + 14/3
2/3*x = 14/3 // : 2/3
x = 14/3/2/3
x = 7
x = 7
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